If only it were that simple, but when you inherit code and projects from multiple sources, these kinds of loosely linked credentials can be lost. We of course have all we need to actually use the app, but for some reason you can’t go from an app ID to the twitter account connected, so you can’t make changes, even when fully authenticated on the app side of things, which seems like an oversight. We’d certainly be happy to fix the issue ourselves if such tools to go from app ID to account were made available, or if an app could be fully administered with solely the app’s credentials, but that seems not to be the case.
We’ve replied to all automated support messages and have still received no actual human intervention, and we’ve been waiting for a week now. I’m sure this is a quick lookup. I hope function can be restored soon.